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How to live without a heart or a brain - Lessons from a Jellyfish

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 Biology   |   Science
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The jellyfish is one weird sea animal. What makes it even weirder is that it doesnt have a brain or a heart. Though it doesnt have a brain, it does have a nervous system in the form of nerve nets and some have a structure called a nerve ring. This allows the jellyfish to reflexively respond to its surroundings. Some jellyfish like box jellyfish even have structures similar to a human eye that can see in 3-D images located inside the edge of their bell.

The jellyfish also dont have a heart and neither do they need it. In animals with a heart, the heart functions to distribute oxygen and nutrients throughout the body. For the jellyfish, oxygen simply diffuses from the water into their cells. Similarly with food, the jellyfish has a rudimentary stomach, called the gastroventricular cavity where food is digested and nutrients are directly absorbed into the jellyfish.

*Nature or evolution arent conscious decision makers, designing life as they see fit. Evolution is a phenomenon where random genetic mutations create changes in traits over many generations.



References:
https://jeb.biologists.org/content/208/13/2475?ijkey=1a9972b0162d48d73674fb1eaa7ad5b9332422c3&keytype2=tf_ipsecsha
https://books.google.co.in/books?id=PVRFDwAAQBAJ&pg=PA26&dq=jellyfish+anatomy+digestion&hl=en&sa=X&ved=0ahUKEwiAsMTEodTpAhVROSsKHWZNAV0Q6AEIKDAA#v=onepage&q=jellyfish%20anatomy%20digestion&f=false
https://jeb.biologists.org/content/214/8/1215
https://www.cell.com/current-biology/fulltext/S0960-9822(13)00359-X



#science #funfacts #jellyfish


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Hand vector created by freepik - www.freepik.com
https://commons.wikimedia.org/wiki/File:Anthracomedusa_turnbulli_fossil_jellyfish_(Mazon_Creek_Lagerstatte,_Francis_Creek_Shale,_Middle_Pennsylvanian;_coal_mine_dump_pile_near_Essex,_northern_Illinois,_USA).jpg
https://commons.wikimedia.org/wiki/File:Anatomy_of_a_jellyfish.svg
https://commons.wikimedia.org/wiki/File:Cubozoan_visual_system_in_Tripedalia_cystophora.png
https://commons.wikimedia.org/wiki/File:Jellyfish_cross_section_numbered.svg
https://en.wikipedia.org/wiki/Copula_sivickisi#/media/File:Copula_sivickisi_female_in_Okinawa-detail.jpg


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